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Looking for a way to test a 68 charger light switch to be sure it functions in each position. Also, is there a relay in the light circuit? Electronics are not my strong point.
There is no relay in the factory circuit. The headlight switch has a thermal circuit breaker built in. I don't have the terminal designations handy, but I believe there are two feeds, one from the main hot splice after the ammeter; which feeds the headlights, and one from the fuse block, this feeds the instrument lamps. I'm looking at a 69 diagram, so no help in the marker lights. Others will know more than myself.